[Intel-gfx] [PATCH 1/2] drm/i915/mtl: Add workarounds Wa_14017066071, Wa_14017654203

[Rodrigo Vivi]

On Thu, Jan 19, 2023 at 05:06:38PM -0800, Radhakrishna Sripada wrote:
> This patch add the workaround to disable Sampler-OOO to avoid hang
> during a benchmark.
> 
> Original Author: Madhumitha Tolakanhalli Pradeep

This is not how we handle this. We keep her original authorship email
and signed-off.

> Signed-off-by: Radhakrishna Sripada <radhakrishna.sripada at intel.com>
> ---
>  drivers/gpu/drm/i915/gt/intel_gt_regs.h     | 1 +
>  drivers/gpu/drm/i915/gt/intel_workarounds.c | 7 +++++++
>  2 files changed, 8 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/gt/intel_gt_regs.h b/drivers/gpu/drm/i915/gt/intel_gt_regs.h
> index 4a4bab261e66..27b06ff380a9 100644
> --- a/drivers/gpu/drm/i915/gt/intel_gt_regs.h
> +++ b/drivers/gpu/drm/i915/gt/intel_gt_regs.h
> @@ -1145,6 +1145,7 @@
>  #define   ENABLE_SMALLPL			REG_BIT(15)
>  #define   SC_DISABLE_POWER_OPTIMIZATION_EBB	REG_BIT(9)
>  #define   GEN11_SAMPLER_ENABLE_HEADLESS_MSG	REG_BIT(5)
> +#define   MTL_DISABLE_SAMPLER_SC_OOO		REG_BIT(3)
>  
>  #define GEN9_HALF_SLICE_CHICKEN7		MCR_REG(0xe194)
>  #define   DG2_DISABLE_ROUND_ENABLE_ALLOW_FOR_SSLA	REG_BIT(15)
> diff --git a/drivers/gpu/drm/i915/gt/intel_workarounds.c b/drivers/gpu/drm/i915/gt/intel_workarounds.c
> index 918a271447e2..c52c5f9ad9ce 100644
> --- a/drivers/gpu/drm/i915/gt/intel_workarounds.c
> +++ b/drivers/gpu/drm/i915/gt/intel_workarounds.c
> @@ -2332,6 +2332,13 @@ rcs_engine_wa_init(struct intel_engine_cs *engine, struct i915_wa_list *wal)
>  		/* Wa_22014600077 */
>  		wa_mcr_masked_en(wal, GEN10_CACHE_MODE_SS,
>  				 ENABLE_EU_COUNT_FOR_TDL_FLUSH);
> +
> +		/*
> +		 * Wa_14017066071: mtl-p/m[a0]
> +		 * Wa_14017654203: mtl-p/m[a0]
> +		 */
> +		wa_mcr_masked_en(wal, GEN10_SAMPLER_MODE,
> +				 MTL_DISABLE_SAMPLER_SC_OOO);
>  	}
>  
>  	if (IS_MTL_GRAPHICS_STEP(i915, M, STEP_A0, STEP_B0) ||
> -- 
> 2.34.1
>